Inspection of TDP and TND bearings (1979)

Turbogenerator after preliminary work.

The axial compressor and turbines have been opened, and the front block has been disassembled.

Having disassembled the thrust bearing of the turboprop, the repairmen check the upper clearance in the liner.

The lead impressions are measured with a micrometer.

The lateral clearances are measured.

The liner skew is checked.

The indicators measure the beat of the thrust ridge.

The uniformity of the rotor neck fit to the lower half of the liner is checked.

A certain gap is set between the pads and the thrust ridge to limit the axial movement of the rotor.

An increase in this gap leads to breakage of the blade apparatus and seals.

Measuring the axial run-up determines the correct installation of the rotor in the unit.

The pads are rolled out of the lower half of the liner.

Checking the pads.

The liner defects are eliminated.

The pads are ground on the control plate and checked for height with an indicator.

Bearing repair.

The bearing is prepared for assembly.

The upper clearance in the support bearing is measured with a lead extractor.

The same operations are repeated as in the case of the thrust bearing.

The results of all measurements are recorded in the repair form.

Measuring the upper clearances on the ridges of the oil seals.

Lead impressions of the clearances.

Measuring the dimensions of the rotor neck with a large micrometer.

Special measuring instruments for measurements during disassembly of bearings are demonstrated.

Low-pressure turbogenerator.

The LPT has one cover for the support and thrust bearings.

Repairmen remove the cover.

The interference fit on the liner is checked.

The first method of checking the interference fit is using lead squeezes.

The second method is using the difference in shaft and bore diameters.

The clearance between the liners can also be measured in two ways.

The first is using lead squeezes.

The squeezes are measured with a micrometer and the dimensions are entered into the repair form.

Measuring the lateral clearances.

Measuring the axial run-up of the turbine rotor.

The pads are rolled out of the lower half of the liner and transferred to the workbench.

The repairman checks each pad.

If the defects are unacceptable, the pad is rejected.

Checking the upper clearance in the LPT support bearing.

The lateral clearances are checked.

The fit of the low-pressure turbine rotor neck to the lower liners is checked.

Using a special device, the rotor is lifted and transferred to a stand.

The rotor journals are checked for ovality and taper.

The detected defects are entered into the form and repairmen fix them.

The inner bore of the liner is measured with a gauge.

The fit of the support pads of the lower half of the liner to the bore in the housing is checked.

Disassembly and repair of the TND bearing parts is complete.

Bearing assembly.